I forgot to say that you could just put your wrist through the noose and push down with your upper body weight, that'd be a good way to know of it'd hold. Positions you can do will depend on if you clear stuff out from there or not. Probably the best one to try is the hovering kneeling position where you make the ligature a little too short for your knees to touch the floor when you kneel so that they hover inches above the floor. Partial doesn't work for everyone though and you'll need to practice quote a bit. If the anchor point doesn't hold then doorframe pull-up bars work well.